Launch live-server with middleware with gzip content encoding

tile-server.sh

#!/bin/bash
# bash script to set up a gzip js as middleware for live-server
if test -f gzip.js; then
  echo "gzip.js exists, launching live-server"
  live-server --middleware="${PWD}/gzip.js"
else
  echo "module.exports = function(req, res, next) {
    if (req.url.endsWith('.pbf')) {
      next();
      res.setHeader('Content-Encoding', 'gzip');
    } else {
      next();
    }
  }" > "gzip.js" 
  live-server --middleware="${PWD}/gzip.js"
fi